<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>GLSL cos function test</title>
<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
<link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>
<script src="../../../js/js-test-pre.js"></script>
<script src="../../../js/webgl-test-utils.js"> </script>
<script src="../../../js/glsl-generator.js"> </script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";

var piConstants = [
  "const float kPI     = 3.14159265358979323846;",
  "const float kHalfPI = (kPI * 0.5);",
  "const float k2PI    = (kPI * 2.0);"
].join("\n");

var kPI = Math.PI;
var kHalfPI = Math.PI * 0.5;
var k2PI = Math.PI * 2.0;
var cos = Math.cos;  // shorthand

GLSLGenerator.runReferenceImageTest({
  feature: "cos",
  args: "$(type) value",
  testFunc: "$(func)($(type))",
  gridRes: 8,
  tolerance: 3,
  extra: piConstants,
  tests: [
    {
      source: ["$(output) = vec4(",
               "    $(func)($(input).x * kHalfPI + kHalfPI),",
               "    $(func)($(input).y * kHalfPI),",
               "    0,",
               "    1);"].join("\n"),
      generator: function(x, y, z, w) {
    return [ cos(x * kHalfPI + kHalfPI),
         cos(y * kHalfPI),
         0,
         1 ];
      },
    },
    {
      source: ["$(output) = vec4(",
           "    $(func)($(input).xy * vec2(kPI, k2PI)) * 0.5 + vec2(0.5, 0.5),",
           "    0, 1);"].join("\n"),
      generator: function(x, y, z, w) {
    return [ cos(x * kPI) * 0.5 + 0.5,
         cos(y * k2PI) * 0.5 + 0.5,
         0,
         1 ];
      },
    },
    {
      // FIXME: for some reason, this test requires a higher tolerance when run in a vertex shader.
      source: ["$(output) = vec4(",
           "    $(func)($(input).xyz * vec3(kPI, k2PI, 4.0)) * ",
           "    0.5 + vec3(0.5, 0.5, 0.5),",
           "    1);"].join("\n"),
      generator: function(x, y, z, w) {
    return [ cos(x * kPI) * 0.5 + 0.5,
         cos(y * k2PI) * 0.5 + 0.5,
         cos(z * 4.0) * 0.5 + 0.5,
         1 ];
      },
      tolerance: 7,
    },
    {
      source: ["$(output) = ",
           "    $(func)($(input) * vec4(k2PI, 4.0, kHalfPI, kPI)) *",
           "    0.5 + vec4(0.5, 0.5, 0.5, 1);",
          ].join("\n"),
      generator: function(x, y, z, w) {
    return [ cos(x * k2PI) * 0.5 + 0.5,
         cos(y * 4.0) * 0.5 + 0.5,
         cos(z * kHalfPI) * 0.5 + 0.5,
         cos(w * kPI) * 0.5 + 1.0 ];
      },
    },
  ]
});
var successfullyParsed = true;
</script>
</body>
</html>

